PURPOSE: To obtain a method for primarily processing and treating root vegetables, etc., in which the root vegetables, etc., primarily processed for regular cooking are treated according to an extremely simple method and can be preserved at ordinary temperature for a long period.

CONSTITUTION: This method for primarily processing and treating root vegetables, etc., includes the first step for treating the root vegetables, etc., to a suitable size for cooking and washing the treated root vegetables, etc., the second step for heating the root vegetables, etc., treated to the suitable size in water from ordinary temperature, the third step for cooling the heated root vegetables, etc., to the ordinary temperature, the fourth step for vacuum packaging the root vegetables, etc., cooled to the ordinary temperature, the fifth step for reheating the vacuum packaged root vegetables, etc., the sixth step for recooling the reheated root vegetables, etc., to the ordinary temperature and the seventh step for quick-freezing the root vegetables, etc., at the ordinary temperature to ≤40°C and keeping the cooled root vegetables, etc., in a frozen state for a suitable time.